Pharmaceutical formulation

ABSTRACT

A formulation for oral administration comprises an expectorant, an analgesic, and at least one additional active ingredient having a modified release providing a therapeutic effect for each of the active ingredients for up to 12 hours.

This application is a continuation of U.S. Application No. 15/291,061, filed Oct. 11, 2016, which claims the benefit of U.S. Provisional Pat. Application Nos. 62/239,775 and 62/239,780, both filed Oct. 9, 2015, the contents of each of which are incorporated by reference herein in their entirety.

TECHNICAL FIELD

The present invention relates to a pharmaceutical formulation. In particular, the present invention is directed to a formulation for oral administration comprising an expectorant, an analgesic, and at least one additional active ingredient which is capable of sustaining a therapeutic effect for each of the actives for at least twelve hours.

BACKGROUND

Pharmaceutical compositions comprising combinations of actives are well-known in the prior art. For example, many over the counter cold and flu remedies include an anti-inflammatory together with an antitussive or cough suppressant. In addition, there are a number of pain killers which are based on a combination of one or more of ibuprofen, aspirin, paracetamol and codeine. There are also available immediate release products which combine more than two actives. For example, the Tylenol® range includes products which combine paracetamol, dextromethorphan and guaifenesin. However, as these products are immediate release products, re-dosing is required every 4 to 6 hours in order to maintain a therapeutic effect.

There is no specific teaching in the prior art of a sustained release dosage form containing guaifenesin, an analgesic and at least one other pharmaceutically active agent which is capable of sustaining a therapeutic effect for each of the actives for at least twelve hours.

Such a combination would be advantageous to develop as it would provide an individual relief from the symptoms of a cough, cold, or flu for an extended period of up to 12 hours. In particular, it would be desirable to develop a product which contains actives that can provide relief from the symptoms of a cough or cold as well as an analgesic. The low solubility of analgesics, however, can impact the dissolution of other active compounds in a combination product. This is particularly true in conventional extended release products where release control is dependent on the erosion of a polymer matrix. Naproxen is an analgesic known in the art to present dissolution/release challenges when formulating the same, especially in combination with other active ingredients.

SUMMARY OF THE INVENTION

The invention is directed to a pharmaceutical composition comprising a pharmaceutically effective amount of each of guaifenesin, naproxen and dextromethorphan.

The invention is further directed to pharmaceutical composition comprising:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 10% at least one sustained release polymer; -   (e) 0.1 - 10% at least one binder; -   (f) 0.1 - 10% at least one disintegrant; -   (g) 5 - 25% at least one diluent; and -   (h) up to 1% at least one lubricant.

The invention is still further directed to a pharmaceutical composition comprising:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 8% hypromellose; -   (e) 5 - 10% microcrystalline cellulose; -   (f) 0.1 - 2% sodium lauryl sulfate; -   (g) 1 - 10% sodium bicarbonate; -   (h) 0.1 - 4.0% croscarmellose sodium; -   (i) 0.1 - 10% polyethylene glycol 4000; -   (j) 1 - 2% hydroxyethyl cellulose; and -   (k) 0.5 - 1% magnesium stearate.

The invention is also directed to a pharmaceutical composition comprising guaifenesin, naproxen and dextromethorphan and at least one pharmaceutically acceptable component, wherein about 100% of naproxen dissolves within 30 minutes in a pH 6.8 phosphate buffer.

The invention is also directed to a pharmaceutical composition comprising guaifenesin, naproxen and dextromethorphan and at least one pharmaceutically acceptable component, wherein the pharmaceutical composition provides a mean C_(max) and at least one of a mean AUC_(inf) and a mean AUC₀₋₁₂ for naproxen under fasted conditions based on single-dose administration that are from 80% to 125% of the mean C_(max) and at least one of the mean AUCinf and the mean AUC₀₋₁₂ for naproxen provided by a pharmaceutical composition comprising (a) 58 - 63% guaifenesin; (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 -3% hypromellose; (e) 5 - 8% microcrystalline cellulose; (f) 1 - 2 % hydroxyethyl cellulose; (g) 0.5 - 2.5% croscarmellose sodium; (h) 0.5 - 1.5% sodium lauryl sulfate; (i) 5 - 8% sodium bicarbonate; (j) 5 - 8% polyethylene glycol 4000; and (k) 0.5 - 1% magnesium stearate.

Preferred embodiments of the invention include pharmaceutical compositions which comprise an immediate release portion and a modified release portion; wherein the dissolution profile of each of the guaifenesin and the dextromethorphan are substantially the same as the dissolution profile of each of guaifenesin and dextromethorphan in a pharmaceutical composition which does not contain naproxen; wherein the dissolution profile of naproxen is substantially the same as the dissolution profile of naproxen in a pharmaceutical composition which does not contain guaifenesin and dextromethorphan; wherein the dissolution of naproxen occurs independently of guaifenesin and dextromethorphan; wherein the dissolution of guaifenesin and dextromethorphan occurs independently of naproxen; wherein an immediate release portion comprises sodium lauryl sulfate and sodium bicarbonate; wherein a ratio of guaifenesin: naproxen: dextromethorphan is from about 40:8:1 to about 10:3:1; wherein the pharmaceutical composition is a bilayer tablet; wherein the pharmaceutical composition is produced by a non-aqueous granulation process; wherein less than 1% of particles comprising an immediate release portion have a particle size diameter of greater than 1000 µm; and/or wherein the pharmaceutical composition provides a therapeutic effect in respect of each of guaifenesin, naproxen and dextromethorphan for a period of up to 12 hours.

BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 shows dextromethorphan and naproxen dissolution results at pH 5.0 (simulated fed state) for embodiments of the present invention.

FIG. 2 shows guaifenesin and naproxen dissolution results at pH 5.0 (simulated fed state) for embodiments of the present invention.

FIG. 3 shows dextromethorphan and naproxen dissolution results at pH 6.8 (simulated fasted state) for embodiments of the present invention.

FIG. 4 shows guaifenesin and naproxen dissolution results at pH 6.8 (simulated fasted state) for embodiments of the present invention.

FIG. 5 shows dextromethorphan, guaifenesin and naproxen dissolution results at pH 6.8 for an embodiment of the present invention.

FIG. 6 shows a comparison of particle size distribution between different embodiments of the present invention.

FIG. 7 shows naproxen dissolution results at pH 6.8 (simulated fasted state) for embodiments of the present invention as well as commercially available Aleve®.

FIG. 8 shows naproxen dissolution results at pH 5.0 (simulated fed state) for embodiments of the present invention as well as commercially available Aleve®.

FIG. 9 shows naproxen dissolution results at pH 6.8 (simulated fasted state) for embodiments of the present invention as well as commercially available Aleve®.

FIG. 10 shows naproxen dissolution results at pH 6.8 (simulated fasted state) for embodiments of an immediate release layer of the present invention as well as commercially available Aleve®.

FIG. 11 shows naproxen dissolution results at pH 5.0 (simulated fed state) for embodiments of an immediate release layer of the present invention as well as commercially available Aleve®.

FIG. 12 shows naproxen dissolution results at pH 6.8 (simulated fasted state) for an embodiment of the present invention as well as commercially available Aleve®.

FIG. 13 shows guaifenesin and dextromethorphan dissolution results at pH 6.8 (simulated fasted state) for an embodiment of the present invention as well as commercially available Mucinex® DM.

FIGS. 14A, 14B, and 14C show dextromethorphan dissolution results for an embodiment of the present invention as well as commercially available Mucinex® DM.

FIGS. 15A, 15B, and 15C show guaifenesin dissolution results for embodiments of the present invention as well as commercially available Mucinex® DM.

FIG. 16 shows dextromethorphan dissolution results at pH 2.0 for embodiments of the present invention as well as commercially available Mucinex® DM.

FIG. 17 shows guaifenesin dissolution results at pH 2.0 for embodiments of the present invention as well as commercially available Mucinex® DM.

FIG. 18 shows naproxen dissolution results for embodiments of the invention as well as commercially available Aleve® tablets and caplets.

FIG. 19 shows mean plasma guaifenesin concentration results for various treatments with embodiments of the present invention.

FIG. 20 shows mean plasma dextromethorphan concentration results for various treatments with embodiments of the present invention.

FIG. 21 shows mean plasma naproxen concentration results for various treatments with embodiments of the present invention.

FIGS. 22-25 show example embodiments of a capsule formulation according to the present invention.

DETAILED DESCRIPTION OF THE INVENTION

According to a first aspect of the present invention, there is provided a pharmaceutical composition comprising a pharmaceutically effective amount of at least three different pharmaceutical actives - an expectorant, an analgesic and at least one additional active ingredient which is an antitussive, a decongestant or an antihistamine. Preferably the composition provides a therapeutic effect in respect of each active for a period of up to 12 hours.

For the avoidance of any doubt, reference to a pharmaceutically active compound includes all enantiomers and stereoisomers thereof, and also all pharmaceutically acceptable salts or esters thereof. For example, naproxen includes naproxen sodium, pseudoephedrine includes pseudoephedrine hydrochloride, and dextromethorphan includes dextromethorphan hydrobromide. All pharmaceutical actives suitable for use in the present invention can be made according to known synthetic procedures or obtained from known commercial sources. In addition, all % amounts referred to herein refer to % by weight of either a total composition or a portion or layer thereof as indicated.

The expectorant according to the first aspect of the invention is selected from ambroxol, acetylcysteine, carboxycysteine, erdosteine, potassium guaiacolsulfonate, potassium iodide, guaifenesin, and combinations thereof. Guaifenesin is preferred for use in the present invention. The pharmaceutically effective amount of expectorant in the pharmaceutical composition can range from about 200 mg to 2400 mg, more preferably about 600 mg to 1200 mg, and most preferably is 600 mg or 1200 mg.

The analgesic according to the first aspect of the invention is a non-steroidal anti-inflammatory drug, preferably selected from naproxen, ketoprofen, diclofenac, ibuprofen, flurbiprofen and combinations thereof. The pharmaceutically effective amount of analgesic in the pharmaceutical composition can range from about 5 mg to 4000 mg, more preferably about 110 mg to 220 mg, and most preferably is 110 mg or 220 mg.

The at least one additional active ingredient according to the first aspect of the invention is an antitussive, a decongestant or an antihistamine. Suitable antitussives include, without limitation, dextromethorphan, codeine, codeine phosphate, codeine sulphate, diphenhydramine citrate, diphenhydramine hydrochloride, and combinations thereof. Suitable decongestants include, without limitation, phenylephrine hydrochloride, phenylpropanolamine hydrochloride, pseudoephedrine, ephedrine, and combinations thereof. Suitable antihistamines include, without limitation, chlorpheniramine maleate, brompheniramine maleate, phenindamine tartrate, pyrilamine maleate, doxylamine succinate, phenyltoloxamine citrate, diphenhydramine hydrochloride, promethazine, clemastine fumerate, tripolidine, and combinations thereof. According to a preferred embodiment, the at least one additional active ingredient is dextromethorphan or pseudoephedrine.

When the at least one additional active ingredient is dextromethorphan, the pharmaceutically effective amount of dextromethorphan in the pharmaceutical composition can range from about 10 mg to 120 mg, more preferably about 15 mg to 60 mg, still more preferably about 25 mg to 35 mg, and most preferably is 30 mg or 60 mg. When the at least one additional active ingredient is pseudoephedrine, the total amount of pseudoephedrine in the pharmaceutical composition can range from about 10 mg to 240 mg, and more preferably about 60 mg to 120 mg.

In a preferred embodiment, the expectorant is guaifenesin, the analgesic is naproxen and the antitussive is dextromethorphan. In such an embodiment, the ratio of guaifenesin:naproxen:dextromethorphan can be from about 40:8:1 to about 10:3:1, more preferably from 22:4:1 to 17:3:1, and most preferably is 20:3.67:1. In such an embodiment, the ratio of guaifensin:naproxen can be from about 1:1 to about 10:1, more preferably from about 2:1 to about 7:1, still more preferably from about 4:1 to about 6:1, and most preferably is about 5.45:1. In such an embodiment, the ratio of the naproxen: dextromethorphan can be from about 1:1 to about 10:1, more preferably from about 2:1 to about 7:1, still more preferably from about 3:1 to about 5:1, and most preferably is about 3.67:1.

When an active other than dextromethorphan is used as the at least one additional active ingredient, the ratio of naproxen: antitussive/decongestant/antihistamine can be from 10:1 to 2:1.

When flurbiprofen is the analgesic, the ratio of expectorant:analgesic:antitussive/decongestant/antihistamine can be from 25:5:1 to 5:0.5:1, with the ratio of expectorant:analgesic from 10:1 to 5:1, and the ratio of analgesic:antitussive/decongestant/antihistamine from 1:1.5 to 1:0.2.

When ibuprofen is the analgesic, the ratio of expectorant:analgesic:antitussive/decongestant/antihistamine can be from 25:30:1 to 5:5:1, with the ratio of expectorant:analgesic from 1:1 to 1:5, and the ratio of analgesic:antitussive/decongestant/antihistamine from 30:1 to 5:1.

When diclofenac is the analgesic, the ratio of expectorant:analgesic:antitussive/decongestant/antihistamine can be from 25:5:1 to 5:0.5:1, with the ratio of expectorant:analgesic from 20:1 to 5:1, and the ratio of analgesic:antitussive/decongestant/antihistamine from 1:2 to 1:0.2.

When ketoprofen is the analgesic, the ratio of expectorant:analgesic:antitussive/decongestant/antihistamine can be from 25:5:1 to 5:0.5:1, with the ratio of expectorant:analgesic from 10:1 to 5:1, and the ratio of analgesic:antitussive/decongestant/antihistamine from 1:1.5 to 1:0.2.

The pharmaceutical composition of the first aspect of the invention can be in the form of one or more tablets, caplets, or capsules, gel, elixir, suspension, syrup, emulsion, powder, or granules. Capsules can be soft capsules or hard capsules. When the composition is in the form of one or more than one tablets or caplets, the tablet(s) or caplet(s) may be contained within a single capsule. A capsule can be made of any suitable material, but is typically made of a gelatin material, hydroxyl propyl methyl cellulose or an alginate. In a preferred embodiment, the capsule is obtained from two shells of hard gelatin which are sealed together around the combined tablets. Alternatively, the capsule can be a one-piece capsule. Soft gelatin capsules are usually prepared from gelatin, glycerin and water, and can absorb several times their own weight in water. Other non-limiting materials for making capsules of the present invention include cellulose esters and/or ethers such as, e.g., hydroxypropylmethylcellulose (HPMC).

Typically, the one or more than one tablets are not in the form of a powdered or granulated composition. Preferably the one or more than one tablets do not comprise a natural gum, such as xanthan gum. After dissolution of the capsule, the one or more than one tablets release the active pharmaceutical ingredients contained therein comparably to each of the at least two tablets being administered individually.

The one or more than one tablets can have the same or a different geometric form, the same or a different weight, and the same or a different volume with the proviso that at least one of the geometric form, weight or volume is different between the tablets. For the avoidance of doubt, in the event that the dosage form comprises three or more tablets, then two or more of the tablets can have the same dimensions. The one or more than one tablets can be coated or uncoated.

The dimensions of the capsule can be selected such that the pharmaceutical dosage form has a shape which is compatible with easy swallowing. The capsule can generally be in the shape of a sphere or an elongated sphere (oblong form). The capsule can have a length of up to 35 mm, a width of up to 15 mm and a depth of up to 15 mm. In a preferred embodiment, the capsule can have a length of 25 - 30 mm, a width of 8 - 10, and a depth of 8 - 10 mm.

The one or more than one tablets can have a surface that is complementary to the face of an adjacent tablet, the two faces being intended to be opposite one another in the final pharmaceutical dosage form. The two faces can be planar or substantially planar. Alternatively, the one or more than one tablets can have a round or ovoid/oval geometry.

Referring firstly to FIG. 22 , a pharmaceutical dosage form in accordance with the present invention is generally depicted at 1. The dosage form 1 comprises a first tablet 2 and a second tablet 3. The tablets 2 and 3 are encased in a gelatin or HPMC capsule 4. The gelatin or HPMC capsule comprises two separate shells 5 and 6. The capsule shells 5 and 6 have different dimensions such that one of the shells is larger than the other. Each of the shells 5 and 6 are provided with means in the form of grooves that allow the shells to reversibly engage with each other. The pharmaceutical dosage form 1 is made by inserting the tablets into the longer shell 5. Shell 6 is then connected to shell 5 to form the final dosage form 1. The tablets of the example embodiments of the present invention can be used using standard tableting procedures well-known to the man skilled in the art. FIGS. 23-25 illustrate alternative embodiments of the present invention in which the tablets are different.

The geometric form of the one or more than one tablets is adapted to the needs of the final dosage form. For example, an existing tablet can be used but its dimensions can be altered without changing the qualitative and quantitative composition of the original tablet.

The pharmaceutical composition preferably comprises immediate and sustained release portions. As set forth herein, “portion” means a part of a whole, either separated or integrated with it. Thus, a product with two or more portions may have, but does not necessarily require, separate or discrete structural elements, e.g., layers. In a particularly preferred embodiment of the invention, the pharmaceutical composition is an oral solid dosage form that is a bilayer tablet. As further set forth herein “sustained release” refers to a pharmaceutical formulation designed to inhibit, retard, or extend release of the active pharmaceutical ingredient(s); “immediate release” refers to a pharmaceutical formulation designed to rapidly release the active pharmaceutical ingredient(s); and “modified release” refers to a pharmaceutical formulation comprising both a sustained release quantity of active pharmaceutical ingredient and an immediate release quantity of active pharmaceutical ingredient, i.e., having both sustained release and immediate release properties. The amount of sustained release quantity and immediate release quantity may or may not be readily measured or numerically quantified.

The analgesic can be incorporated into the composition such that it is the sole active in the portion in which it is contained. Typically, the composition is provided with both sustained release and immediate release portions comprising the expectorant.

A preferred embodiment of the first aspect of the invention is a pharmaceutical composition which comprises at least three distinct portions wherein two of the portions have immediate release characteristics and a third has sustained release characteristics, wherein one of the immediate release portions comprises an expectorant and an additional active ingredient which is an antitussive or a decongestant, and the second immediate release portion comprises an analgesic having a half-life of twelve hours, and wherein the sustained release portion comprises guaifenesin and an additional active ingredient which is an antitussive or a decongestant. This pharmaceutical composition may comprise a first composition which comprises both immediate and sustained release portions of the expectorant and the additional active ingredient which is an antitussive or a decongestant and a second composition which comprises an analgesic having a therapeutic effect of twelve hours.

In a further preferred embodiment of the first aspect of the invention, the pharmaceutical composition comprises a first immediate release portion which comprises guaifenesin and a decongestant or an antitussive, a second immediate release portion which comprises naproxen, and a sustained release portion which comprises guaifenesin and a decongestant or an antitussive. In further preferred embodiments, the antitussive can be dextromethorphan or the decongestant can be pseudoephedrine.

In still another preferred embodiment, a first immediate release portion and a sustained release portion constitute a bilayer tablet and a second immediate release portion is another tablet. In a more preferred embodiment, the bilayer tablet and the another tablet are contained in a capsule.

In another preferred embodiment, the pharmaceutical composition takes the form of a bilayer tablet, which can be manufactured according to any method known to those of ordinary skill in the art. The resulting tablet may comprise the two portions compressed against one another so that the face of each portion is exposed as either the top or bottom of the tablet, or the resulting tablet may comprise the sustained release portion in the center coated by the immediate release portion so that only the immediate release portion is exposed. In a more preferred embodiment, a bilayer tablet of the present invention comprises the two portions compressed against one another so that the face of each portion is exposed.

As would be readily understood by one of ordinary skill in the art, the pharmaceutical compositions of the first aspect of the present invention may comprise at least one pharmaceutically acceptable component in addition to the three different pharmaceutical actives. Such components include, without limitation, polymers as binders, lubricants, colorants, other binders, surface active agents, disintegrants, diluents, glidants, preservatives, stabilizers, fillers, anti-adherents, coatings and any other component known to one of ordinary skill in the art. When present, these components are present in an amount which can be readily determined by one of ordinary skill in the art. As would be further readily understood by one of ordinary skill in the art, one or more of these components may be more suited for inclusion in a sustained release portion or an immediate release portion, when such portions are present in the pharmaceutical composition of the present invention. For example, a sustained release portion of a pharmaceutical composition may additionally preferably comprise one or more of polymers as binders, lubricants, colorants, other binders, glidants, surface active agents, and preservatives, while an immediate release portion may additionally preferably comprise one or more of disintegrants, lubricants, colorants, binders, glidants, surface active agents, preservatives, and stabilizers.

Sustained release polymers suitable for use as binders in the pharmaceutical compositions of the present invention include, without limitation, acacia, adipic acid, agar, alginic acid, aliphatic polyesters, calcium alginate, carbomer, carrageenan, castor oil, cellaburate, cellulose acetate, ceratonia, colophony, copovidone, glyceryl behenate, glyceryl monooleate, glyceryl monostearate, glyceryl palmitostearate, hydroxypropyl betadex, hydroxypropyl cellulose, hydroxyethyl cellulose, hypromellose, hypromellose acetate succinate, methylcellulose, polacrilin potassium, polycarbophil, polydextrose, polymethacrylates, polyoxylglycerides, polyvinyl acetate dispersion, shellac, sodium alginate, sodium hyaluronate, modified starch, sucrose stearate, microcrystalline wax, white wax, yellow wax, xanthan gum, zein, and combinations thereof. As would be readily appreciated by one of ordinary skill in the art, such sustained release polymers are best suited for inclusion in a sustained release portion of a pharmaceutical composition.

Hydrophilic polymers suitable for use, especially in a sustained release portion, in a pharmaceutical composition of the present invention include, without limitation, one or more natural or partially or totally synthetic hydrophilic gums such as acacia, gum tragacanth, locust bean gum, guar gum, and karaya gum; modified cellulosic substances such as methylcellulose, hydroxymethylcellulose, hydroxypropyl methylcellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, hydroxyethylcellulose, carboxyethylcellulose; proteinaceous substances such as agar, pectin, carrageen, and alginates; and other hydrophilic polymers such as carboxypolymethylene, gelatin, casein, zein, bentonite, magnesium aluminium silicate, polysaccharides, and modified starch derivatives, and other hydrophilic polymers known to those of skill in the art and combinations thereof.

These hydrophilic polymers gel and dissolve slowly in aqueous acidic media thereby allowing the expectorant, e.g., guaifenesin to diffuse from the gel in the stomach. When the gel reaches the intestines, it dissolves in controlled quantities in the higher pH medium, where the guaifenesin itself is fairly absorbable, to allow sustained release of guaifenesin throughout the digestive tract. Preferred hydrophilic polymers are the hydroxypropyl methylcelluloses such as those manufactured by the Dow Chemical Company and known as METHOCEL™ ethers. In one preferred embodiment of a sustained release formulation, the hydrophilic polymer is a METHOCEL™ ether known as METHOCEL™ E10M.

Water-insoluble polymers suitable for use, especially in a sustained release portion, in a pharmaceutical composition of the present invention are polymers which generally do not dissolve in solutions of a pH below 5 and dissolve more slowly in basic solutions than the hydrophilic polymers. Because the polymer is insoluble in low pH environments such as those found in gastric fluid, it aids in retarding drug release in those regions. Likewise, because the polymer dissolves more slowly in solutions of higher pH than hydrophilic polymers, it aids in retarding drug release throughout the intestines. This overall delayed release results in a more uniform serum concentration of expectorant, e.g., guaifenesin.

Water-insoluble polymers suitable for use then include, without limitation, polyacrylic acids, acrylic resins, acrylic latex dispersions, cellulose acetate phthalate, polyvinyl acetate phthalate, hydroxypropyl methylcellulose phthalate, carbomer, other polymers known to those of skill in the art, and combinations thereof. In a preferred embodiment, a sustained release portion comprises the acrylic resin CARBOPOL® 974P supplied by BF Goodrich.

Other suitable binders include, without limitation, attapulgite, calcium carbonate, calcium lactate, ceratonia, colophony, copovidone, ethylcellulose, ethylene glycol and vinyl alcohol grafted copolymer, gelatin, glucose, hydroxethylmethyl celluose, magnesium aluminium silicate, methylcellulose, polycarbophil, polydextrose, polyethylene oxide, polymethacrylates, povidone, pullulan, vitamin E polyethylene glycol succinate, sucrose, lactose, starch paste, acacia, tragacanth, povidone, polyethylene glycol, corn syrup and combinations thereof.

Lubricants suitable for use include, without limitation, magnesium stearate, calcium stearate, zinc stearate, powdered stearic acid, hydrogenated vegetable oils, talc, polyethylene glycol, mineral oil and combinations thereof. calcium stearate, glyceryl behenate, leucine, magnesium stearate, mineral oil, myristic acid, palm oil, palmitic acid, poloxamer, polyethylene glycol, potassium benzoate, sodium benzoate, sodium lauryl sulfate, sodium stearate, sodium stearyl fumarate, stearic acid, sucrose stearate, talc, vegetable oil, zinc stearate

Colorants suitable for use include, without limitation, emerald green lake, FD&C Red #40, FD&C Yellow #6, FD&C Yellow #10, FD&C Blue #1 and combinations thereof. In one preferred embodiment, a sustained release portion further comprises magnesium stearate and emerald green lake. In another preferred embodiment, a sustained release formulation further comprises magnesium stearate and FD&C Blue #1 aluminum lake dye.

Glidants suitable for use include, without limitation, colloidal silicon dioxide, talc and combinations thereof.

Surface active agents suitable for use include, without limitation, sodium lauryl sulfate, dioctyl sodium sulfosuccinate, triethanolamine, polyoxyethylene sorbitan, poloxalkol, quarternary ammonium salts and combinations thereof.

Preservatives suitable for use include, without limitation, benzyl alcohol, parabens, cetylpyridine chloride, glycerin, potassium sorbate, sodium benzoate, sorbic acid, sodium propionate, and combinations thereof.

Stabilizers suitable for use include, without limitation, alginate, colloidal silicone dioxide, corn starch, glycerin, hydroxypropyl celluloses, hydroxypropyl methylcelluloses, propylene glycol, saccharin sodium, and combinations thereof.

Suitable disintegrants include, without limitation, carboxymethylcellulose calcium, carboxymethylcellulose sodium, chitosan, colloidal silicon dioxide, croscarmellose sodium, crospovidone, glycine, guar gum, lactose, magnesium aluminum silicate, polacrilin potassium, povidone, sodium alginate, sodium starch glycolate.

Suitable diluents include, without limitation, calcium carbonate, calcium lactate, calcium phosphate, calcium silicate, calcium sulfate, cellaburate, cellulose acetate, microcrystalline cellulose, silicified microcrystalline cellulose, corn syrup solids, dextrates, dextrin, dextrose, erythritol, ethylcellulose, fructose, inulin, isomalt, kaolin, lactitol, lactose, magnesium carbonate, magnesium oxide, maltitol, maltodextrin, maltose, mannitol, triglycerides, polydextrose, simethicone, sodium bicarbonate, sodium carbonate, sodium chloride, sorbitol, sucrose, sugar, sulfobutylether β-cyclodextrin, sunflower oil, talc, trehalose, xylitol, and combinations thereof.

Other excipients suitable for use include, without limitation, lactose, mannitol, glucose, fructose, xylose, galactose, sucrose, maltose, xylitol, sorbitol, chloride, sulfate and phosphate salts of potassium, sodium, and magnesium, and combinations thereof.

In an alternative embodiment, the immediate release portion which comprises guaifenesin may further comprise the additional or more actives in the form of a drug/ active-resin complex.

The pharmaceutical composition of the first aspect of the present invention may be made by any known formulary technique. For example, when the pharmaceutical composition takes the form of a tablet, the tablets can be made using standard tableting procedures well-known to the person of ordinary skill in the art.

The pharmaceutical composition according to the first aspect may comprise:

-   (a) 50 - 85% guaifenesin; -   (b) up to 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; and -   (c) 5 - 30% naproxen or a pharmaceutically acceptable salt thereof.

The pharmaceutical composition according to the first aspect may comprise:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 10% sustained release polymers; -   (e) 0.1 - 10% binders; -   (f) 0.1 - 5% disintegrants; -   (g) 5 - 25% diluents; and -   (h) up to 1% lubricants.

A preferred embodiment of the composition according to the first aspect may comprise:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 8% hypromellose; -   (e) 10 - 25% microcrystalline cellulose; -   (f) 0.1 - 2.5% povidone; -   (g) 0.1 - 4.0% croscarmellose sodium; -   (h) 0.1 - 2.0% hydroxy ethyl cellulose; and -   (i) up to 1% magnesium stearate.

Another preferred pharmaceutical composition may comprise:

-   (a) 58 - 63% guaifenesin; -   (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 2% hypromellose; -   (e) 15 - 25% microcrystalline cellulose; -   (f) 1 - 2 % povidone; -   (g) 0.5 - 2.5% croscarmellose sodium; -   (h) 0.5 - 1% hydroxyethyl cellulose; and -   (i) up to 0.5% magnesium stearate.

In still another preferred embodiment, the pharmaceutical composition may comprise:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 8% hypromellose; -   (e) 10 - 25% microcrystalline cellulose; -   (f) 0.1 - 2.5% povidone; -   (g) 0.1 - 2.0% carbomer; -   (h) 0.1 - 2.0% sodium starch glycolate; and -   (i) up to 1% magnesium stearate.

In a still further preferred embodiment, the pharmaceutical composition may comprise:

-   (a) 59 - 65 % guaifenesin; -   (b) 3 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 6% hypromellose; -   (e) 10 - 20% microcrystalline cellulose; -   (f) 0.3 - 1% povidone; -   (g) 0.5 - 1% carbomer; -   (h) 0.1 - 0.5% sodium starch glycolate; and -   (i) up to 1% magnesium stearate.

In another preferred embodiment, the pharmaceutical composition may comprise:

-   (a) 59 - 65 % guaifenesin; -   (b) 3 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 1 - 6% hypromellose; -   (e) 10 - 20% microcrystalline cellulose; -   (f) 0.3 - 1% povidone; -   (g) 0.5 - 1% carbomer; -   (h) 1 - 2% croscarmellose sodium; -   (i) 0.1 - 0.5% sodium starch glycolate; and -   (j) up to 1% magnesium stearate.

In a preferred embodiment of the first aspect of the present invention, an analgesic-containing immediate release portion can comprise:

-   (a) 50 - 52% naproxen or a pharmaceutically acceptable salt thereof; -   (b) 35 - 40% microcrystalline cellulose; -   (c) up to 5% povidone; -   (d) 5 - 8% croscarmellose sodium; and -   (e) up to 1% magnesium stearate.

In alternative preferred embodiments of the first aspect of the invention, an analgesic-containing immediate release portion can comprise:

-   (a) 70 - 75% naproxen or a pharmaceutically acceptable salt thereof; -   (b) 20 - 25% microcrystalline cellulose; -   (c) up to 5% povidone; -   (d) up to 1% magnesium stearate.

In a preferred embodiment of the first aspect of the present invention, a guaifenesin-containing immediate release portion can comprise:

-   (a) 30 - 40% guaifenesin; -   (b) up to 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 50 - 60% microcrystalline cellulose; -   (d) up to 7% povidone; -   (e) up to 7% croscarmellose sodium; and -   (f) up to 1% magnesium stearate.

In alternative preferred embodiments of the first aspect of the present invention, a guaifenesin-containing immediate release portion can comprise:

-   (a) 40 - 50% guaifenesin; -   (b) up to 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 40 - 50% microcrystalline cellulose; -   (d) up to 5% hypromellose; -   (e) up to 5% sodium starch glycolate; and -   (f) up to 1% magnesium stearate.

In a preferred embodiment of the first aspect of the present invention, a sustained release portion can comprise:

-   (a) 80 - 90% guaifenesin; -   (b) up to 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) up to 10% hypromellose; -   (d) up to 5% carbomer; and -   (e) up to 1.55% magnesium stearate.

In alternative preferred embodiments of the first aspect of the present invention, a sustained release portion can comprise:

-   (a) 80 - 90% guaifenesin; -   (b) 3 - 6% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) up to 5% hypromellose; -   (d) up to 2% hydroxyethyl cellulose; -   (e) up to 5% microcrystalline cellulose; and -   (f) up to 1% magnesium stearate.

According to a second aspect of the present invention, there is provided a sustained-release polymer matrix which consists essentially of a combination of a hydroxypropylmethyl cellulose having a molecular weight of 100,000 – 500,000 and a hydroxyethyl cellulose having a molecular weight of 500,000 – 2,000,000. This polymer matrix is suitable for use in a sustained release portion of a pharmaceutical composition according to the first aspect of the invention.

The molecular weight of the hydroxypropylmethyl cellulose is more preferably 200,000 to 300,000, and most preferably is 250,000. The molecular weight of the hydroxyethyl cellulose is more preferably 1,000,000 to 1,500,000, and most preferably is 1,300,000. A ratio of the hydroxypropylmethyl cellulose:hydroxyethyl cellulose ranges from 1:1 to 3:1, more preferably from 2:1 to 2.5:1, and most preferably is 2.1:1 or 1:1.

According to a third aspect of the present invention, there is provided a pharmaceutical composition comprising a pharmaceutically effective amount of each of guaifenesin, naproxen and dextromethorphan. Amounts of each of these active ingredients, ratios of inclusion, and sources are the same for the third aspect of the invention as noted above with regard to the first aspect of the invention.

Ideally the dissolution profile of each of the guaifenesin and the dextromethorphan is substantially the same as the dissolution profile of each of guaifenesin and dextromethorphan in a pharmaceutical composition which does not contain naproxen, e.g., Mucinex® DM. Likewise, the dissolution profile of naproxen is substantially the same as the dissolution profile of naproxen in a pharmaceutical composition which does not contain guaifenesin and dextromethorphan. As used herein, “substantially the same” refers to having a dissolution profile that is the same or better than a comparitor naproxen product that does not contain guaifenesin and dextromethorphan, e.g., Aleve®. In other words, the dissolution or release of naproxen occurs independently of the dissolution or release of guaifenesin and dextromethorphan and/or the dissolution or release of guaifenesin and dextromethorphan occurs independently of the dissolution or release of naproxen. In still other words, the dissolution of naproxen is not affected by the presence of guaifenesin and dextromethorphan and/or the dissolution of guaifenesin and dextromethorphan is not affected by the presence of naproxen.

As in the first aspect of the invention, the pharmaceutical composition of the third aspect can be in the form of one or more tablets, caplets, or capsules, gel, elixir, suspension, syrup, emulsion, powder, or granules. Details with regard to these dosage forms are the same for the third aspect as noted above with regard to the first aspect. A preferred embodiment of the third aspect is directed to an oral solid dosage form such as a tablet. Both matrix tablets and tablets having discrete portions are included in this aspect of the invention. A more preferred embodiment is directed to a bilayer tablet.

In a preferred embodiment of the third aspect of the invention, the pharmaceutical composition comprises an immediate release portion and a modified release portion as defined above with regard to the first aspect. In a further preferred embodiment, substantially all of the naproxen is contained in the immediate release portion. As used herein, “substantially all” refers to at least 90%, more preferably at least 95%, and most preferably 100%, of the amount included. In a still further preferred embodiment, a substantial amount of the guaifenesin is contained in the modified release portion and/or a substantial amount of the dextromethorphan is contained in the modified release portion. As used herein, “a substantial amount” refers to at least 65%, more preferably at least 75%, and most preferably about 83%, of the amount included with regard to guaifenesin and at least 55%, more preferably at least 65%, and most preferably about 73% with regard to dextromethorphan. In another preferred embodiment, guaifenesin is contained in both the immediate release portion and the modified release portion and/or dextromethorphan is contained in both the immediate release portion and the modified release portion. Pharmaceutical compositions of the third aspect having immediate and sustained release portions exhibit the same independent dissolution for each of guaifenesin, dextromethorphan and naproxen explained above.

In another preferred embodiment of the third aspect, the pharmaceutical composition takes the form of a matrix tablet which exhibits the same independent dissolution for each of guaifenesin, dextromethorphan and naproxen explained above.

The pharmaceutical compositions of the third aspect of the invention may include additional components such as, without limitation, polymers as binders, lubricants, colorants, other binders, surface active agents, disintegrants, diluents, glidants, preservatives, stabilizers, fillers, anti-adherents, coatings, and any other component known to one of ordinary skill in the art. Details for these components, i.e., potential identities and amounts, are the same as detailed above with respect to the first aspect of the invention.

A preferred embodiment of the third aspect of the invention is directed to a pharmaceutical composition comprising sodium lauryl sulfate and sodium bicarbonate. In a more preferred embodiment, the pharmaceutical composition comprising sodium lauryl sulfate and sodium bicarbonate comprises an immediate release layer containing substantially all of the naproxen. When present, sodium lauryl sulfate and sodium bicarbonate are typically used in a ratio of sodium lauryl sulfate:sodium bicarbonate preferably ranging from about 1:1 to about 1:10, more preferably from about 3:4 to about 3:25, still more preferably from about 2:5 to about 7:50, and most preferably is about 1:6. Sodium lauryl sulfate is typically present in an amount ranging from about 1 mg to about 50 mg, more preferably from about 3 mg to about 25 mg, still more preferably from about 5 mg to about 15 mg, and most preferably about 10 mg. Sodium bicarbonate is typically present in an amount ranging from about 25 mg to about 100 mg, more preferably from about 35 mg to about 80 mg, still more preferably from about 45 mg to about 75 mg, and most preferably about 60 mg.

Preferably the pharmaceutical composition of the third aspect is a tablet made using a wet granulation or a non-aqueous granulation. More preferably a non-aqueous granulation is used to make a tablet of the third aspect of the invention; most preferably the non-aqueous granulation is used to make an immediate release portion of a tablet pharmaceutical composition.

In traditional wet granulation, active ingredients and other components are combined, water is added, the wet mass is granulated using a suitable granulator, and then dried. In non-aqueous granulation, or hot-melt granulation, active ingredients and other components are combined, molten polymer is added as a binder, and the mass is granulated using a suitable granulator. Non-aqueous granulation is preferred herein since it involves fewer process steps and it reduces the amount of hydration, which has been found by the present inventors to negatively interfere with the dissolution and assay of the naproxen and to present processing issues, i.e., undesirable hard build-up of material on the granulator walls.

In further preferred embodiments of the third aspect of the invention, the molten polymer has a temperature ranging from about 50-80° C. since the melting point of guaifenesin is about 75-80°. Any wax-type excipient or use material can be used as the molten binder. The wax material is used in an immediate release portion or layer only and has a use range of between 0 and 30% in the immediate release portion or layer. In a preferred embodiment, polyethylene glycol is used as the hot-melt polymer binder in the non-aqueous granulation; more preferably, any grade of high molecular weight polyethylene glycol that is solid or semi-solid at room temperature is used; most preferably, polyethylene glycol 4000 is used. Furthermore, the amount of polyethylene glycol used in the hot-melt granulation ranges from about 5% to about 30%, more preferably from about 10% to about 20%, still more preferably from about 10% to about 15%, and is most preferably about 12.5%, by weight of an immediate release portion. In other words, the ratio of polyethylene glycol to other components in an immediate release portion ranges from about 1:19 to about 3:7, more preferably from about 1:9 to about 1:4, still more preferably from about 1:9 to about 3:17, and is most preferably about 1:7. The amount of polyethylene glycol, then, in a pharmaceutical composition of the third aspect of the invention preferably ranges from about 1% to about 10%, more preferably from about 3% to about 8%, and most preferably from about 4% to about 6%, by weight of a pharmaceutical composition.

According to a preferred embodiment of the third aspect of the invention, less than 1% of particles comprising the immediate release portion have a particle size diameter of greater than 1000 µm.

When the hot-melt or non-aqueous granulation is used to make the pharmaceutical composition of the third aspect of the invention, additional binder materials may be used. Preferably these binders are selected from polyoxyl stearates, stearic acid, cetyl or stearyl alcohol, various waxes, mono-di- and triglycerides, and combinations thereof.

As part of the hot-melt or non-aqueous granulation, it is possible to subdivide the granulation materials to add to the granulator in portions, to premix an active ingredient with certain excipients prior to adding them to the granulator (e.g., premixing naproxen with sodium bicarbonate and sodium lauryl sulfate), and to reserve a portion or all of certain excipients (e.g., microcrystalline cellulose, croscarmellose sodium and magnesium stearate) to add to the granulator after granules have been formed with the rest of the excipients and active ingredients. One of ordinary skill in the art will readily understand that additional steps such as screening and basing may also be used herein.

Embodiments according to the third aspect of the invention, not unlike embodiments of the first aspect of the invention, provide multi-symptom cough/cold/flu relief for a period of about 12 hours. In other words, the pharmaceutical compositions provide a therapeutic effect in respect of each active for a period of up to 12 hours.

A preferred embodiment of the pharmaceutical composition according to the third aspect may comprise:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 10% sustained release polymers; -   (e) 0.1 - 10% binders; -   (f) 0.1 - 10% disintegrants; -   (g) 5 - 25% diluents; and -   (h) up to 1% lubricants.

Another preferred embodiment of the composition according to the third aspect may comprise:

-   (a) 55 - 65% guaifenesin; -   (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 8% hypromellose; -   (e) 5 - 10% microcrystalline cellulose; -   (f) 0.1 - 2% sodium lauryl sulphate; -   (g) 1 - 10% sodium bicarbonate; -   (h) 0.1 - 4.0% croscarmellose sodium; -   (i) 0.1 - 10% polyethylene glycol 4000; -   (j) 1 - 2% hydroxy ethyl cellulose; and -   (k) 0.5 - 1% magnesium stearate.

Another preferred pharmaceutical composition may comprise:

-   (a) 58 - 63% guaifenesin; -   (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 3% hypromellose; -   (e) 5 - 8% microcrystalline cellulose; -   (f) 1 - 2 % hydroxyethyl cellulose; -   (g) 0.5 - 2.5% croscarmellose sodium; -   (h) 0.5 - 1.5% sodium lauryl sulphate; -   (i) 5 - 8% sodium bicarbonate; -   (j) 5 - 8% polyethylene glycol 4000; and -   (k) 0.5 - 1% magnesium stearate.

A preferred composition for a sustained release portion of a pharmaceutical composition of the third aspect of the invention may comprise:

-   (a) 80 - 90% guaifenesin; -   (b) 3 - 6% dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) up to 5% hypromellose; -   (d) up to 5% hydroxy ethylcellulose; -   (e) up to 5% microcrystalline cellulose; and -   (f) up to 1% magnesium stearate.

A preferred embodiment of the third aspect of the present invention is directed to a pharmaceutical composition comprising guaifenesin, naproxen and dextromethorphan and at least one pharmaceutically acceptable component, wherein about 100% of naproxen dissolves within 30 minutes in a pH 6.8 phosphate buffer. In another preferred embodiment, at least about 90% of naproxen dissolves within 20 minutes in a pH 6.8 phosphate buffer. A further preferred embodiment according to the third aspect is directed to a pharmaceutical composition having the noted dissolution properties and comprising:

-   (a) 58 - 63% guaifenesin; -   (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt     thereof; -   (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; -   (d) 1 - 3% hypromellose; -   (e) 5 - 8% microcrystalline cellulose; -   (f) 1 - 2 % hydroxyethyl cellulose; -   (g) 0.5 - 2.5% croscarmellose sodium; -   (h) 0.5 - 1.5% sodium lauryl sulfate; -   (i) 5 - 8% sodium bicarbonate; -   (j) 5 - 8% polyethylene glycol 4000; and -   (k) 0.5 - 1% magnesium stearate.

A still further preferred embodiment is directed to a pharmaceutical composition having the noted dissolution properties and comprising the components noted in any of the below examples, e.g., Examples 9, 11, 13, etc.

Still another preferred embodiment of the third aspect of the invention is directed to a pharmaceutical composition comprising guaifenesin, naproxen and dextromethorphan and at least one pharmaceutically acceptable component, wherein the pharmaceutical composition provides a mean C_(max) and at least one of a mean AUC_(inf) and a mean AUC₀₋₁₂ for naproxen under fasted conditions based on single-dose administration that are from 80% to 125% of the mean C_(max) and at least one of the mean AUCinf and the mean AUC₀₋₁₂ for naproxen provided by a pharmaceutical composition comprising (a) 58 - 63% guaifenesin; (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 - 3% hypromellose; (e) 5 - 8% microcrystalline cellulose; (f) 1 - 2 % hydroxyethyl cellulose; (g) 0.5 - 2.5% croscarmellose sodium; (h) 0.5 - 1.5% sodium lauryl sulfate; (i) 5 - 8% sodium bicarbonate; (j) 5 - 8% polyethylene glycol 4000; and (k) 0.5 - 1% magnesium stearate. A further preferred embodiment is directed to the same pharmaceutical composition wherein the comparison is at a 90% confidence interval. A still further preferred embodiment is directed to a pharmaceutical composition having the noted mean C_(max) and at least one of a mean AUCinf and a mean AUC₀₋₁₂ properties and comprising the components noted in any of the below examples, e.g., Examples 9, 11, 13, etc.

A fourth aspect of the present invention is directed to the non-aqueous granulation process described above with regard to the third aspect of the invention. More specifically, the fourth aspect is directed to a process of making a pharmaceutical composition comprising a pharmaceutically effective amount of each of guaifenesin, naproxen and dextromethorphan, said process comprising the step of hot-melt granulating a mixture of guaifenesin, naproxen, dextromethorphan and at least one pharmaceutically acceptable binder. Details regarding suitable binders, amounts of active ingredients, etc. are as set forth above with regard to the first and third aspects of the invention. The hot-melt granulation process preferably provides an immediate release portion containing naproxen of a pharmaceutical composition according to the third aspect.

According to a fifth aspect of the present invention, there is provided a method of providing relief from the symptoms of bronchial conditions, coughing and symptoms or diseases associated with coughing comprising administering to an individual a pharmaceutical composition as described in the first and third aspects of the invention set forth above. The preferred dosages are as follows: 220 mg naproxen, 60 mg dextromethorphan and 1200 mg guaifenesin. The dosage may be administered as one discrete pharmaceutical composition according to the invention, or more preferably is administered as more than one, most preferably two, discrete pharmaceutical compositions. In other words, the dosage may be administered as, for example, one tablet containing the entire dosage or as more than one tablet containing a portion of the entire dosage. In a most preferred embodiment, the entire dosage is administered in two tablets.

As used herein, the term “about” means that the numerical value is approximate and small variations would not significantly affect the practice of the disclosed embodiments. Where a numerical limitation is used, unless indicated otherwise by the context, “about” means the numerical value can vary by ±10% and remain within the scope of the disclosed embodiments.

As used herein, the term “consisting essentially of” means the composition contains the indicated components and may contain additional components provided that the additional components that are non-active and do not materially affect the composition’s basic characteristics. As used herein, the term “consisting of” means the composition contains the only indicated components and excludes other components. The terms “composition” and “formulation” are used interchangeably throughout the present application.

For the avoidance of doubt when the composition of the present invention is in the form of a tablet or tablets, the values given for both the ranges and amounts of the components in the compositions of the present invention refer to uncoated tablets. Additional coatings can be added as required.

Various preferred embodiments of the present invention may be used in various combinations with other preferred embodiments of the invention except where stated otherwise and except where to do so would be inconsistent. For example, a preferred embodiment of the third aspect of the invention related to the inclusion of sodium lauryl sulfate and sodium bicarbonate can be combined with a preferred embodiment of the third aspect of the invention related to the inclusion of polyethylene glycol. Likewise a preferred embodiment of the first aspect of the invention may be combined with a preferred embodiment of the third aspect of the invention, etc.

Specific embodiments of the invention will now be demonstrated by reference to the following examples. It should be understood that these examples are disclosed solely by way of illustrating the invention and should not be taken in any way to limit the scope of the present invention.

Example 1

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated.

Tablet 1: Naproxen Ingredient mg/tablet % Weight Naproxen Sodium 110.0 73.33 Microcrystalline Cellulose 34.45 22.96 Povidone 4.50 3.0 Mg Stearate 1.05 0.7% Total Tablet 150.0 100.0

Tablet 2: Immediate/Sustained Release Dextromethorphan and Guaifenesin Ingredient mg/tablet % Weight Guaifenesin 600.0 76.41 Hypromellose 50.00 6.37 MCC 87.52 11.15 Dextromethorphan HBr 30.0 3.82 Carbomer 7.50 0.96 Sodium Starch Glycolate 3.98 0.51 Colorant 0.20 0.025 Mg Stearate 6.0 0.76 Total Tablet 785.2 100.0

Example 2

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated.

Tablet 1: Naproxen Ingredient mg/tablet % Weight Naproxen Sodium 110.0 51.16 Microcrystalline Cellulose 81.00 37.67 Crospovidone 7.50 3.49 Croscarmellose sodium 15.00 6.98 Mg Stearate 1.50 0.7 Total Tablet 215.0 100.0

Tablet 2: Immediate/Sustained Release Dextromethorphan and Guaifenesin Ingredient mg/tablet % Weight Guaifenesin 600.0 74.77 Hypromellose 19.00 2.37 MCC 129.40 16.12 Dextromethorphan HBr 30.0 3.74 Povidone 7.00 0.87 Croscarmellose Sodium 6.00 0.74 Hydroxy ethyl cellulose 9.00 1.12 Colorant 0.20 0.025 Mg Stearate 1.9 0.24 Total Layer 802.5 100.0

Example 3

A composite tablet according to the present invention was made having the below-listed components. Each layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 140 28.58 Dextromethorphan HBr 8 1.63 Naproxen Sodium 110 22.45 Microcrystalline Cellulose 60 12.24 Povidone 11 2.25 Croscarmellose sodium 26 5.31 Crospovidone 9.8 2.00 Sodium lauryl sulfate 25 5.10 Bicarbonate 100 20.41 Mg Stearate 0.1 0.02 Total Tablet 489.9 100.0

Modified Release Layer Ingredient mg/tablet % Weight Guaifenesin 460 84.73 Dextromethorphan HBr 22 4.05 Hypromellose 28 5.16 Hydroxy ethyl cellulose 14 2.58 Microcrystalline Cellulose 17 3.13 Colorant 0.1 0.02 Mg Stearate 1.8 0.33 Total Layer 542.9 100.0

Example 4

A composite tablet according to the present invention was made having the below-listed components. Each layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 200 45.25 Dextromethorphan HBr 10 2.26 Naproxen Sodium 110 24.89 Microcrystalline Cellulose 45 10.18 Povidone 11 2.49 Crospovidone 65 14.71 Mg Stearate 1 0.23 Total Tablet 442 100.0

Modified Release Layer Ingredient mg/tablet % Weight Guaifenesin 400 84.54 Dextromethorphan HBr 20 4.23 Hypromellose 24.5 5.18 Hydroxy ethyl cellulose 12.25 2.59 Microcrystalline Cellulose 14.75 3.12 Colorant 0.1 0.02 Mg Stearate 1.55 0.33 Total Layer 473.15 100.0

Example 5

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Tablet 1: Naproxen Ingredient mg/tablet % Weight Naproxen Sodium 110.0 73.33 Microcrystalline Cellulose 14.55 9.7 Lactose 12.65 8.4 Povidone 4.65 3.1 Croscarmellose sodium 7.15 4.8 Mg Stearate 1 0.7 Total Tablet 150.0 100.0

Tablet 2: Immediate/Sustained Release Dextromethorphan and Guaifenesin Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 200 63.77 Dextromethorphan HBr 10 3.19 Microcrystalline Cellulose 85 27.10 Povidone 10 3.19 Croscarmellose Sodium 8.5 2.71 Mg Stearate 0.15 0.05 Total Layer 313.6 100.00

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 400 84.54 Dextromethorphan HBr 20 4.23 Hypromellose (K100M) 24.5 5.18 Microcrystalline Cellulose 14.75 3.12 Colorant 0.1 0.02 Mg Stearate 1.55 0.33 Total Layer 473.15 100.0 Total Tablet 786.8 100.0

Example 6

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Tablet 1: Naproxen Ingredient mg/tablet % Weight Naproxen Sodium 110 73.33 Microcrystalline Cellulose 6 4.00 Lactose 5 3.33 Povidone 3 2.00 Sodium lauryl sulfate 25 g 16.67 Mg Stearate 1 0.67 Total Tablet 150.0 100.0

Tablet 2: Immediate/ Sustained Release Dextromethorphan and Guaifenesin Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 200 63.77 Dextromethorphan HBr 10 3.19 Microcrystalline Cellulose 85 27.10 Povidone 10 3.19 Croscarmellose Sodium 8.5 2.71 Mg Stearate 0.15 0.05 Total Layer 313.65 100.00

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 400 84.54 Dextromethorphan HBr 20 4.23 Hypromellose (K100M) 24.5 5.18 Hydroxyethylcellulose 12.25 2.59 Microcrystalline Cellulose 14.75 3.12 Colorant 0.1 0.02 Mg Stearate 1.55 0.33 Total Layer 473.15 100.00 Total Tablet 786.8 100.0

Example 7

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Tablet 1: Naproxen Ingredient mg/tablet % Weight Naproxen Sodium 110.0 73.33 Microcrystalline Cellulose 14.55 9.7 Lactose 12.65 8.4 Povidone 4.65 3.1 Croscarmellose sodium 7.15 4.8 Mg Stearate 1 0.7 Total Tablet 150.0 100.0

Tablet 2: Immediate/Modified Release Dextromethorphan and Guaifenesin Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 130 54.83 Dextromethorphan HBr 7.00 2.95 Microcrystalline Cellulose 85.00 35.85 Povidone 8.00 3.37 Croscarmellose Sodium 7.00 2.95 Mg Stearate 0.10 0.04 Total Layer 237.10 100.00

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 470 86.35 Dextromethorphan HBr 23 4.23 Hypromellose (K100M) 17 3.12 Hydroxyethylcellulose 17 3.12 Microcrystalline Cellulose 15.5 2.85 Colorant 0.1 0.02 Mg Stearate 1.7 0.31 Total Layer 544.3 100.00 Total Tablet 781.40 100.0

Example 8

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Tablet 1: Naproxen Ingredient mg/tablet % Weight Naproxen Sodium 110 73.33 Microcrystalline Cellulose 6 4.00 Lactose 5 3.33 Povidone 3 2.00 Sodium lauryl sulfate 25 16.67 Mg Stearate 1 0.67 Total Tablet 150.0 100.0

Tablet 2: Immediate/ Sustained Release Dextromethorphan and Guaifenesin Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 130 54.83 Dextromethorphan HBr 7.00 2.95 Microcrystalline Cellulose 85.00 35.85 Povidone 8.00 3.37 Croscarmellose Sodium 7.00 2.95 Mg Stearate 0.10 0.04 Total Layer 237.10 100.00

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 470 86.35 Dextromethorphan HBr 23 4.23 Hypromellose (K100M) 17 3.12 Hydroxyethylcellulose 17 3.12 Microcrystalline Cellulose 15.5 2.85 Colorant 0.1 0.02 Mg Stearate 1.7 0.31 Total Layer 544.3 100.00 Total Tablet 781.40 100.0

Example 9

A composite tablet according to the present invention was made having the below-listed components. The immediate release layer was made according to the hot-melt granulation method described herein, and the sustained release layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 100 24.30429 Dextromethorphan HBr 8 1.944343 Naproxen Sodium 110 26.73472 Microcrystalline Cellulose 45 10.93693 Croscarmellose sodium 23 5.589987 Sodium lauryl sulfate 10 2.430429 Sodium bicarbonate 60 14.58257 Polyethylene glycol 4000 51.45 12.50456 Mg Stearate 4 0.972172 Total Tablet 411.45 100.0

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 500 85.77653 Dextromethorphan HBr 22 3.774168 Hypromellose 28 4.803486 Hydroxy ethyl cellulose 14 2.401743 Microcrystalline Cellulose 16.29 2.7946 Colorant 0.82 0.140674 Mg Stearate 1.8 0.308796 Total Layer 582.91 100.0

Example 10

A composite tablet according to the present invention was made having the below-listed components. The immediate release layer was made according to the hot-melt granulation method described herein, and the sustained release layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 100 24.30429 Dextromethorphan HBr 8 1.94434 Naproxen Sodium 110 26.73472 Microcrystalline Cellulose 45 10.93693 Croscarmellose sodium 23 5.58999 Sodium lauryl sulfate 10 2.43043 Sodium bicarbonate 60 14.58257 Polyethylene glycol 4000 51.45 12.50456 Mg Stearate 4 0.97217 Total Tablet 411.45 100.0

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 505 89.3489 Dextromethorphan HBr 22.5 3.98089 Methocel E10 25 4.42322 Carbomer Homopolymer 7.5 1.32696 Type B NF Colorant 0.2 0.03539 Mg Stearate 5 0.88464 Total Layer 565.2 100.0

Example 11

A composite tablet according to the present invention was made having the below-listed components in a scaled-up manufacture. The immediate release layer was made according to the hot-melt granulation method described herein, and the sustained release layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 100 24.30429 Dextromethorphan HBr 8 1.944343 Naproxen Sodium 110 26.73472 Microcrystalline Cellulose 45 10.93693 Croscarmellose sodium 23 5.58999 Sodium lauryl sulfate 10 2.43043 Sodium bicarbonate 60 14.58257 Polyethylene glycol 4000 51.45 12.50456 Mg Stearate 4 0.97217 Total Tablet 411.45 100.0

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 500 85.77653 Dextromethorphan HBr 22 3.774168 Hypromellose 28 4.803486 Hydroxy ethyl cellulose 14 2.401743 Microcrystalline Cellulose 16.29 2.7946 Colorant 0.82 0.140674 Mg Stearate 1.8 0.308796 Total Layer 582.91 100.0

Example 12

A pharmaceutical composition according to the present invention was made by inserting Tablet 1 and Tablet 2 below in a gelatin capsule which is then sealed. Tablets 1 and 2 were made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Tablet 1: Naproxen Ingredient mg/tablet Naproxen Sodium 110 Microcrystalline Cellulose 81 Povidone 7.50 Croscarmellose sodium 15 Magnesium stearate 1.50 Total Tablet 215.0

Tablet 2: Immediate/ Sustained Release Dextromethorphan and Guaifenesin Immediate Release Layer Ingredient mg/tablet Guaifenesin 70.00 Dextromethorphan HBr 4.50 Microcrystalline Cellulose 112.40 Povidone 7.00 Croscarmellose Sodium 6.00 Mg Stearate 0.10 Total Layer 200.00

Sustained Release Layer Ingredient mg/tablet Guaifenesin 530 Dextromethorphan HBr 25.5 Hypromellose (K100M) 19.00 Hydroxyethylcellulose 9.0 Microcrystalline Cellulose 17.0 Colorant 0.20 Mg Stearate 1.8 Total Layer 602.5

Example 13

A composite tablet according to the present invention was made having the below-listed components. The immediate release layer was made according to the hot-melt granulation method described herein, and the sustained release layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 100 24.30429 Dextromethorphan HBr 8 1.944343 Naproxen Sodium 110 26.73472 Microcrystalline Cellulose 45 10.93693 Croscarmellose sodium 23 5.589987 Sodium lauryl sulfate 10 2.430429 Sodium bicarbonate 60 14.58257 Polyethylene glycol 4000 51.45 12.50456 Mg Stearate 4 0.972172 Total Tablet 411.45 100.0

Sustained Release Layer Ingredient mg/tablet % Weight Guaifenesin 500 85.77653 Dextromethorphan HBr 22 3.774168 Hypromellose 18 3.17511 Hydroxy ethyl cellulose 8 1.41116 Microcrystalline Cellulose 16.29 2.7946 Colorant 0.82 0.140674 Mg Stearate 1.8 0.308796 Total Layer 566.91 100.0

Example 14

An immediate release layer for a composite tablet according to the present invention was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet Guaifenesin 100.00 Dextromethorphan HBr 8.00 Naproxen Sodium 110.00 Microcrystalline Cellulose 45.00 Croscarmellose sodium 23.00 Povidone 11.00 Sodium lauryl sulfate 10.00 Sodium bicarbonate 30.00 Mg Stearate 4.00 Total Tablet 371.00

The naproxen, sodium lauryl sulfate and sodium bicarbonate were separately pre-blended.

Example 15

An immediate release layer for a composite tablet according to the present invention was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet % Weight Guaifenesin 100.00 60.60606 Dextromethorphan HBr 8.00 4.84848 Microcrystalline Cellulose 30.00 18.18182 Croscarmellose sodium 15.00 9.09091 Povidone 12.00 7.27273 Total 165.00 100.00

The above ingredients were dry blended and then dry blended with the diluent microcrystalline cellulose and the disintegrant croscarmellose sodium and with a further wet granulation having the following components:

Ingredient mg/tablet % Weight Naproxen sodium 110.00 51.76471 Microcrystalline Cellulose 25.00 11.76471 Povidone 7.50 3.52941 Sodium lauryl sulfate 10.00 4.70588 Sodium bicarbonate 60.00 28.23529 Total 212.50 100.00 Ingredient mg/tablet % Weight Croscarmellose Sodium 10.50 36.842105 Microcrystalline Cellulose 18.00 63.157895

The above dry blended wet granulations with diluent and disintegrant are then dry blended with the lubricant Magnesium stearate to yield a total formula:

Ingredient mg/tablet % Weight Guaifenesin 100.00 24.39024 Dextromethorphan HBr 8.00 1.95122 Naproxen Sodium 110.00 26.82927 Microcrystalline Cellulose 62.00 15.12196 Croscarmellose sodium 36.50 8.90244 Povidone 19.50 4.75610 Sodium Bicarbonate 60.00 14.63415 Sodium Lauryl Sulfate 10.00 2.43902 Magnesium Stearate 4.00 0.97561 Total Tablet 410.00

Example 16

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet % Weight Guaifenesin 100.00 22.91 Dextromethorphan HBr 8.00 1.83 Naproxen Sodium 110.00 25.20 Microcrystalline Cellulose 45.00 10.31 Croscarmellose sodium 34.00 7.79 Sodium lauryl sulfate 10.00 2.29 Sodium bicarbonate 60.00 13.75 Polyethylene glycol 4000 65.45 15.00 Mg Stearate 4.00 0.92 Total Tablet 436.45 100.0

Example 17

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet % Weight Guaifenesin 100.00 23.61 Dextromethorphan HBr 8.00 1.89 Naproxen Sodium 110.00 25.97 Microcrystalline Cellulose 45.00 10.62 Croscarmellose sodium 23.00 5.43 Sodium lauryl sulfate 10.00 2.36 Sodium bicarbonate 60.00 14.17 Polyethylene glycol 4000 63.55 15.00 Mg Stearate 4.00 0.94 Total Tablet 423.55 100.0

Example 18

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet %Weight Guaifenesin 100.00 25.60623 Naproxen Sodium 110.00 28.16685 Dextromethorphan HBr 8.00 2.04850 Microcrystalline Cellulose 45.00 11.52280 Croscarmellose sodium 23.00 5.88943 Povidone 11.00 2.81669 Sodium Lauryl Sulfate 10.00 2.56062 Sodium bicarbonate 60.00 15.36374 Polyethylene glycol 4000 19.51 5.00090 Mg Stearate 4.00 1.02425 Total Tablet 390.51 100

Example 19

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet %Weight Guaifenesin 100.00 24.25830 Naproxen Sodium 110.00 26.68413 Dextromethorphan HBr 8.00 1.94066 Microcrystalline Cellulose 45.00 10.91624 Croscarmellose sodium 23.00 5.57941 Povidone 11.00 2.66841 Sodium Lauryl Sulfate 10.00 2.42583 Sodium bicarbonate 60.00 14.55498 Polyethylene glycol 4000 41.23 10.00170 Mg Stearate 4.00 0.97033 Total Tablet 412.23 100

Example 20

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet %Weight Guaifenesin 100.00 22.25140 Naproxen Sodium 110.00 24.47654 Dextromethorphan HBr 8.00 1.78011 Microcrystalline Cellulose 45.00 10.01313 Croscarmellose sodium 34.00 7.56547 Sodium lauryl sulfate 10.00 2.22514 Sodium bicarbonate 60.00 13.35084 Polyethylene glycol 4000 67.41 14.99967 Mg Stearate 4.00 0.89006 Total Tablet 436.47 100.00

Example 21

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet %Weight Guaifenesin 100.00 23.61108 Naproxen Sodium 110.00 25.97219 Dextromethorphan HBr 8.00 1.88889 Microcrystalline Cellulose 45.00 10.62499 Croscarmellose sodium 23.00 5.43055 Sodium Lauryl Sulfate 11.00 2.36111 Sodium bicarbonate 60.00 14.16665 Polyethylene Glycol 6000 63.55 15.00012 Mg Stearate 4.00 0.94444 Total Tablet 423.55 100.00

Example 22

An immediate release layer for a composite tablet according to the present invention was made according to the hot-melt granulation method described herein. The immediate release layer can be combined with a suitable sustained release layer by compression.

Ingredient mg/tablet %Weight Guaifenesin 100.00 23.61108 Naproxen Sodium 110.00 25.97219 Dextromethorphan HBr 8.00 1.88889 Microcrystalline Cellulose 45.00 10.62499 Croscarmellose sodium 23.00 5.43055 Sodium Lauryl Sulfate 11.00 2.36111 Sodium bicarbonate 60.00 14.16665 Polyethylene Glycol 3350 63.55 15.00012 Mg Stearate 4.00 0.94444 Total Tablet 423.55 100.00

Example 23

A composite tablet according to the present invention was made having the below-listed components. Each layer was made according to a known wet granulation tableting method, i.e., excipients and actives were dry blended, water was added, and the mixture was granulated. The immediate release layer and the sustained release layer were combined by compression.

Immediate Release Layer Ingredient mg/tablet % Weight Guaifenesin 100 26.95418 Dextromethorphan HBr 8 2.15633 Naproxen Sodium 110 29.64960 Microcrystalline Cellulose 45 12.12938 Povidone 11 2.96496 Croscarmellose sodium 23 6.19946 Sodium lauryl sulfate 10 2.69542 Sodium bicarbonate 60 16.17251 Mg Stearate 4 1.07817 Total Tablet 371 100.0

Modified Release Layer Ingredient mg/tablet % Weight Guaifenesin 500 85.7780 Dextromethorphan HBr 22 3.7742 Hypromellose 28 4.8036 Hydroxy ethyl cellulose 14 2.4018 Microcrystalline Cellulose 16.29 2.7946 Colorant 0.81 0.1390 Mg Stearate 1.8 0.3088 Total Layer 582.9 100.0

Testing Dissolution Testing

Dissolution tests for each of guaifenesin, naproxen and dextromethorphan were run at pH 5.0 and 6.8 for each of Examples 12, 9 and 11. The same dissolution test was run for commercially available Aleve® containing naproxen. Dissolution testing at pH 6.8 was performed for Mucinex® DM containing guaifenesin and dextromethorphan HBr. Dissolution tests for the immediate release layers of Examples 12, 16, and 23 were also run. The results are shown in FIGS. 1-4 and 8-12 and in Tables 1-14 below.

Test Method D8247706 [2.0] Dissolution Medium, also used as diluent - 50 Mm Phosphate Buffer, pH6.8 Mobile Phase: A - 0.1% H₃PO₄ in Water B - 0.1% H₃PO₄ in Methanol Stock Solution: Dextromethorphan HBr - 0.425 mg/Ml Naproxen Sodium - 1 mg/mL

Table 1 Dissolution at pH 5.0 for Example 12 Time (min) 0 60 120 360 720 Guaifenesin 0 38.92 54.72 86.05 102.14 Dextromethorphan 0 46.75 64.28 95.76 107.79 Naproxen 0 99.66 101.23 101.4 102.28

Table 2 Dissolution at pH 5.0 for Example 9 Time (min) 0 60 120 360 720 Guaifenesin 0 35.12 49.11 78.6 98.13 Dextromethorphan 0 41.6 56.11 83.34 98.33 Naproxen 0 94.42 101.48 102.75 103.26

Table 3 Dissolution at pH 5.0 for Example 11 Time (min) 0 60 120 360 720 Guaifenesin 0 38.5 50.5 78.8 97.4 Dextromethorphan 0 48.1 59.9 84.5 99.5 Naproxen 0 102.1 103.6 103.8 104.2

Table 4 Dissolution at pH 6.8 for Example 12 Time (min) 0 60 120 360 720 Guaifenesin 0 35.33333 48.66667 79.83333 97.83333 Dextromethorphan 0 38.666667 51.83333 81.5 97.33333 Naproxen 0 97 97.66667 97.66667 98.16667

Table 5 Dissolution at pH 6.8 for Example 9 Time (min) 0 60 120 360 720 Guaifenesin 0 39.59125 52.145 80.46625 97.27625 Dextromethorphan 0 46.8 58.6175 84.12 97.3025 Naproxen 0 98.47 98.88175 97.935 98.7225

Table 6 Dissolution at pH 6.8 for Example 11 Time (min) 0 10 20 30 45 60 120 360 720 Guaifenesin 0 16.7 24.6 29.4 34.1 38.1 50.5 79.2 96.4 Dextromethorphan 0 20 29.7 34.9 40 43.8 55.8 81.7 94.4 Naproxen 0 58.8 91.8 100.7 102.2 102.4 102.7 103 103.3

Table 7 Dissolution at pH 6.8 for Aleve® Time (min) 0 10 20 30 45 60 Naproxen 0 81.19 93.92667 93.55 93.60333 93.9

Table 8 Dissolution at pH 5.0 for Aleve® Time (min) 0 10 20 30 45 60 Naproxen 0 16.6 33.6 42.7 51.4 58.5

Table 9 Dissolution at pH 6.8 for Example 23 Time (min) 0 10 20 30 45 60 Naproxen 0 75 90 95 97 98

Table 10 Dissolution Data at pH 6.8 for Example 16 (immediate release layer only) Time (min) 0 10 20 30 45 60 Guaifenesin 0 46.4 75.9 92.7 99.1 100.4 Dextromethorphan 0 40.0 65.7 86.5 93.5 94.4 Naproxen 0 48.4 75.6 92.7 99.0 99.6

Table 11 Dissolution Data at pH 5.0 for Example 16 (immediate release layer only) Time (min) 0 10 20 30 45 60 Guaifenesin 0 49.0 79.6 96.9 101.3 101.0 Dextromethorphan 0 22.2 39.6 56.8 102.5 103.2 Naproxen 0 42.2 70.7 77.4 75.9 76.9

Table 12 Dissolution Data at pH 6.8 for Example 11 (immediate release layer only) Time (min) 0 10 20 30 45 60 Guaifenesin 0 58.8 88.8 102.2 102.4 101.8 Dextromethorphan 0 54.3 79 88.3 92.9 91.3 Naproxen 0 57.3 84.9 96.7 96.9 96.5

Table 13 Dissolution Data at pH 5.0 for Example 11 (immediate release layer only) Time (min) 0 10 20 30 45 60 Guaifenesin 0 66.4 92.6 96.8 97.7 97.2 Dextromethorphan 0 57.4 83.1 91 93.3 93.3 Naproxen 0 57.3 84.9 96.7 96.9 96.5

Table 14 Dissolution at pH 6.8 for Mucinex® DM Time (min) 0 10 20 30 45 60 120 360 720 Guaifenesin 0 23.66 667 29 35.16 667 40.33 333 43.83 333 54.16 667 78.33 333 95.83 333 Dextrometh orphan 0 17.66 667 22.33 333 27.83 333 33 36.5 47.83 333 75.33 333 95

Dissolution tests for each of guaifenesin, naproxen and dextromethorphan were run at pH 6.8 for Example 13. The results are shown in FIG. 5 and in Table 15 below.

Test Method D8247706 [2.0] Dissolution Medium, also used as diluent - 50 Mm Phosphate Buffer, pH6.8 Mobile Phase: A - 0.1% H₃PO₄ in Water B - 0.1% H₃PO₄ in Methanol Stock Solution: Dextromethorphan HBr - 0.425 mg/Ml Naproxen Sodium - 1 mg/mL

Table 15 Dissolution at pH 6.8 for Example 13 Time (min) 0 60 120 360 720 Guaifenesin 0 41.71 58.25 87.14 99.23 Dextromethorphan 0 49.5 66.55 93.09 102.93 Naproxen 0 97.91 101.54 99.32 99.41

Dissolution results for Example 13 found to release expectorant and antitussive quicker than current marketed product (Table 14) due to decrease in polymeric content (FIG. 13 ).

In addition, naproxen dissolution results comparing Aleve®, Example 23 and Example 12 are as shown in FIG. 7 .

Particle Size Distribution Testing

Particle size distribution tests (USP General Test 786: agitate sieve for 5 minutes, weigh each sieve before sieving without material, and after sieving with material contained) were conducted for the immediate release layers of Examples 9 and 14. The results are shown in FIG. 6 and in Tables 16-17 below.

Table 16 Example 9 Particle Size (µm) Initial Sieve Weight Final Sieve Weight Mass of particles in sieve Percentage of particles in the sieve Cumulative Frequency <106 247.27 265.66 18.39 18.48241206 18.48241206 >106 422.27 450.61 28.34 28.48241206 46.96482412 >212 445.68 460.01 14.33 14.40201005 61.36683417 >300 453.16 471.49 18.33 18.42211055 79.78894472 >500 480.22 492.28 12.06 12.12060302 91.90954774 >710 505.54 512.58 7.04 7.075376884 98.98492462 >1000 497.03 497.90 0.87 0.874371859 99.85929648 Total Weight Added 99.5

Table 17 Example 14 Wet Granulation Particle Size (µm) Initial Sieve Weight Final Sieve Weight Mass of particles in sieve Percentage of particles in the sieve Cumulative Frequency <106 248.06 254.48 6.42 6.419358064 6.419358064 >106 418.75 434.87 16.12 16.11838816 22.53774623 >212 278.22 292.30 14.08 14.07859214 36.61633837 >300 451.04 473.31 22.27 22.26777322 58.88411159 >500 477.67 488.76 11.09 11.08889111 69.9730027 >710 503.6 515.91 12.31 12.30876912 82.28177182 >1000 496.56 513.75 17.19 17.18828117 99.47005299 Total Weight Added 100.01

Bioavailability Testing

A pilot, phase I, open label, single dose, randomized, 5-period, 5-sequence, crossover relative bioavailability study of two combination modified-release formulations of 600 mg guaifenesin, 110 mg naproxen sodium and 30 mg dextromethorphan hydrobromide, dosed each as two capsules under fasted and fed conditions compared to a combination of Mucinex® DM and naproxen sodium reference products under fasted conditions was conducted.

As used herein, C_(max) is the maximum blood serum concentration that is achieved from a dose and is a measure of how quickly a drug is released and absorbed. As used herein, AUC is the area under the curve in a concentration vs. time profile and is a measure of how much total drug a person is exposed to. As used herein, CI (confidence interval) is a range that a certain percentage of data points falls within and is a measure of the variability of the sample set. FDA guidance stipulates that C_(max) and AUC mean values and 90% CI must be within 80% - 125% to establish bioequivalency.

The following study treatment arms were used:

Table 18 Treatment Formula Conditions A DG2/N1 FASTED B DG2/N1 FED C DG1/N2 FASTED D DG1/N2 FED E REFERENCE* FASTED *Reference treatment is 2 Mucinex® DM 600/30 mg tablets and 1 Aleve® 220 mg tablet.

The following are descriptions of the study treatment arms:

Treatment A —Capsule DG2/N1 (After 10-hour Fast): Two (2) capsules each containing an extended-release bi-layer tablet with 600 mg guaifenesin and 30 mg dextromethorphan hydrobromide and a “fast” immediate-release tablet with 110 mg naproxen sodium, administered with 240 ml of water after an overnight fast of at least 10 hours.

Treatment B - Capsule DG2/N1 (After a High-Fat Meal): Two (2) capsules each containing an extended-release bi-layer tablet with 600 mg guaifenesin and 30 mg dextromethorphan hydrobromide and a “fast” immediate-release tablet with 110 mg naproxen sodium, administered with 240 ml of water 30 minutes after the beginning of the consumption of a high-fat standardized breakfast, preceded by an overnight fast of at least 10 hours.

Treatment C -Capsule DG1/N2 (After 10-hour Fast): Two (2) capsules each containing an extended-release bi-layer tablet with 600 mg guaifenesin and 30 mg dextromethorphan hydrobromide and a “slow” immediate release tablet with 110 mg naproxen sodium, administered with 240 ml of water after an overnight fast of at least 10 hours.

Treatment D -Capsule DG1/N2 (After a High-Fat Meal): Two (2) capsules each containing an extended-release bi-layer tablet with 600 mg guaifenesin and 30 mg dextromethorphan hydrobromide and a “slow” immediate release tablet with 110 mg naproxen sodium, administered with 240 ml of water 30 minutes after the beginning of the consumption of a high-fat standardized breakfast, preceded by an overnight fast of at least 10 hours.

Treatment E — Reference (After 10-hour Fast): Two Mucinex® DM (600 mg guaifenesin, 30 mg dextromethorphan hydrobromide) extended-release bi-layer tablets and one Aleve® tablet (220 mg naproxen sodium) administered with 240 ml of water after an overnight fast of at least 10 hours.

The following bilayer tablet formulations were used as the DG1 and DG2 sustained release formulae (Table 19) and the naproxen tablet formulations N1 and N2 (Table 20):

Table 19 Current Mucinex® DM 600 DG1 DG2 IR Component Mg/tablet Mg/tablet Mg/tablet Guaifenesin 95.00 95.00 70.00 Dextromethorphan HBr 7.50 7.50 4.50 Microcrystalline cellulose 87.52 87.52 112.40 Hypromellose 5.00 5.00 Sodium starch glycolate 3.98 3.98 Povidone 7.00 Croscarmellose sodium 6.00 Magnesium stearate 1.00 1.00 1.00 Total IR 200.00 200.00 200.00 Component Mg/tablet Mg/tablet Mg/tablet MR Guaifenesin 505.00 505.00 530.00 Dextromethorphan HBr 22.50 22.50 25.50 Hypromellose 25.00 45.00 Carbomer homopolymer type B 7.50 7.50 Hypromellose 19.00 Hydroxyethylcellulose 9.00 Microcrystalline cellulose 17.00 Colorant 0.20 0.20 0.20 Magnesium stearate 5.00 5.00 1.80 Total MR 565.20 285.20 602.50 Total tablet 765.20 785.20 802.50

Table 20 Aleve® tablet N1 N2 Component Mg/tablet Mg/tablet Mg/tablet Naproxen sodium 220.00 110.00 110.00 Microcrystalline cellulose n/a 81.00 34.45 Povidone n/a 7.50 4.50 Croscarmellose sodium 15.00 Magnesium stearate n/a 1.50 1.05 Hypromellose n/a Polyethylene glycol n/a Talc n/a Colorant n/a Titanium dioxide n/a ~300 215.00 150.00

Dextromethorphan dissolution profiles for each of Mucinex® DM, DG1 and DG2 were determined as shown in FIGS. 14A, 14B, and 14C. Guaifenesin dissolution profiles for each of Mucinex® DM, DG1 and DG2 were determined as shown in FIGS. 15A, 15B, and 15C. In addition, FIG. 16 and Table 21 show dextromethorphan dissolution (pH 2, 0.01N HCl, basket, 50 RPM) for each of Mucinex® DM, DG1 and DG2, while FIG. 17 and Table 22 show guaifenesin dissolution (pH 2, 0.01N HCl, basket, 50 RPM) for each of Mucinex® DM, DG1 and DG2. FIG. 18 shows naproxen dissolution (pH 7.4, paddle, 50 RPM, 50 mM phosphate buffer) for each of Aleve® tablet, Aleve® caplet, N1 and N2.

Table 21 Dextromethorphan dissolution Time (hr) Lower Limit (%) Upper Limit (%) Commercial Avg (%) Modified Bilayer (%) New Bialyer (%) 1 31 51 43 50 47 2 48 68 58 62 61 6 80 100 88 86 91 12 91 104 99 96 102 f2 66.5 72.3

Table 22 Guaifenesin dissolution Time (hr) Lower Limit (%) Upper Limit (%) Commercial Avg (%) Modified Bilayer (%) New Bilayer (%) 1 23 43 33 39 37 2 37 57 47 52 50 6 72 92 79 79 81 12 90 104 98 96 101 f2 68.1 73.0

Plasma guaifenesin, dextromethorphan, and naproxen concentrations were determined for each of the treatments above by known methods and were as shown in FIGS. 19-21 , respectively. Further, AUC_(0-t), AUC_(0-inf) and C_(max) were determined as follows in Tables 23-25:

Table 23 Guiafenesin parameters AUC _(0-t) (%) AUC _(0-inf) (%) C_(max) (%) Fast/Fasted Vs Reference (A Vs E) 94.62 94.66 88.18 Fast/Fed Vs Fast/Fasted (B Vs A) 94.18 94.16 103.79 Slow/Fasted Vs Reference (C Vs E) 88.77 89.08 77.55 Slow/Fed Vs Slow/Fasted (D Vs C) 100.42 100.17 105.24

Table 24 Dextromethorphan parameters. AUC _(0-t) (%) AUC _(0-inf) (%) C_(max) (%) Fast/Fasted Vs Reference (A Vs E) 101.86 101.39 99.77 Fast/Fed Vs Fast/Fasted (B Vs A) 117.55 118.85 130.61 Slow/Fasted Vs Reference (C Vs E) 109.89 110.31 92.16 Slow/Fed Vs Slow/Fasted (D Vs C) 106.90 106.73 130.58

Table 25 Naproxen parameters AUC _(0-t) (%) AUC _(0-inf) (%) C_(max) (%) Fast/Fasted Vs Reference (A Vs E) 94.66 95.14 90.97 Fast/Fed Vs Fast/Fasted (B Vs A) 94.25 96.51 73.31 Slow/Fasted Vs Reference (C Vs E) 97.80 99.14 93.34 Slow/Fed Vs Slow/Fasted (D Vs C) 97.91 98.92 71.74

The tested compositions according to the present invention also provide for more consistent release of both guaifenesin and dextromethorphan when compared to current commercial products in various pH conditions and when exposed to various agitation speeds. For example purposes only, these formulations have been shown to improve the consistency of dextromethorphan release after 6 hours by 29% and guaifenesin release after 6 hours by 52% and 71% as shown above.

Numerous alterations, modifications, and variations of the preferred embodiments disclosed herein will be apparent to those skilled in the art, and they are all anticipated and contemplated to be within the spirit and scope of the claimed invention. For example, although specific embodiments have been described in detail, those with skill in the art will understand that the preceding embodiments and variations can be modified to incorporate various types of substitute, additional, or alternative materials. Accordingly, even though only few variations of the present invention are described herein, it is to be understood that the practice of such additional modifications and variations and the equivalents thereof, are within the spirit and scope of the invention as defined in the following claims. All patent applications, patents, and other publications cited herein are incorporated by reference in their entirety. 

1. A pharmaceutical composition comprising a pharmaceutically effective amount of each of guaifenesin, naproxen and dextromethorphan.
 2. The pharmaceutical composition according to claim 1, wherein the pharmaceutical composition comprises an immediate release portion and a modified release portion.
 3. The pharmaceutical composition according to claim 2, wherein substantially all of the naproxen is contained in the immediate release portion.
 4. The pharmaceutical composition according to claim 2, wherein a substantial amount of the guaifenesin is contained in the modified release portion.
 5. The pharmaceutical composition according to claim 2, wherein a substantial amount of the dextromethorphan is contained in the modified release portion.
 6. The pharmaceutical composition according to claim 2, wherein guaifenesin is contained in both the immediate release portion and the modified release portion.
 7. The pharmaceutical composition according to claim 2, wherein dextromethorphan is contained in both the immediate release portion and the modified release portion.
 8. The pharmaceutical composition according to claim 1, wherein the dissolution profile of each of the guaifenesin and the dextromethorphan are substantially the same as the dissolution profile of each of guaifenesin and dextromethorphan in a pharmaceutical composition which does not contain naproxen.
 9. The pharmaceutical composition according to claim 1, wherein the dissolution profile of naproxen is substantially the same as the dissolution profile of naproxen in a pharmaceutical composition which does not contain guaifenesin and dextromethorphan.
 10. (canceled)
 11. (canceled)
 12. The pharmaceutical composition according to claim 9, wherein the pharmaceutical composition comprises an immediate release portion containing substantially all of the naproxen and a modified release portion.
 13. The pharmaceutical composition according to claim 12, wherein the immediate release portion comprises sodium lauryl sulfate and sodium bicarbonate.
 14. The pharmaceutical composition according to claim 1, wherein a ratio of guaifenesin: naproxen: dextromethorphan is from about 40:8:1 to about 10:3:1. 15-19. (canceled)
 20. The pharmaceutical composition according to claim 2, wherein the pharmaceutical composition is a bilayer tablet.
 21. The pharmaceutical composition according to claim 2 produced by a non-aqueous granulation process.
 22. (canceled)
 23. A pharmaceutical composition comprising: (a) 55 - 65% guaifenesin; (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 - 10% at least one sustained release polymer; (e) 0.1 - 10% at least one binder; (f) 0.1 - 10% at least one disintegrant; (g) 5 - 25% at least one diluent; and (h) up to 1% at least one lubricant.
 24. A pharmaceutical composition comprising: (a) 55 - 65% guaifenesin; (b) 1 - 5% dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 5 - 15% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 - 8% hypromellose; (e) 5 - 10% microcrystalline cellulose; (f) 0.1 - 2% sodium lauryl sulfate; (g) 1 - 10% sodium bicarbonate; (h) 0.1 - 4.0% croscarmellose sodium; (i) 0.1 - 10% polyethylene glycol 4000; (j) 1 - 2% hydroxyethyl cellulose; and (k) 0.5 - 1% magnesium stearate.
 25. The pharmaceutical composition according to claim 24, wherein the pharmaceutical composition comprises: (a) 58 - 63% guaifenesin; (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 - 3% hypromellose; (e) 5 - 8% microcrystalline cellulose; (f) 1 - 2 % hydroxyethyl cellulose; (g) 0.5 - 2.5% croscarmellose sodium; (h) 0.5 - 1.5% sodium lauryl sulfate; (i) 5 - 8% sodium bicarbonate; (j) 5 - 8% polyethylene glycol 4000; and (k) 0.5 - 1% magnesium stearate.
 26. A pharmaceutical composition having a dissolution profile for naproxen similar to the dissolution profile of a pharmaceutical composition according to claim
 25. 27. A pharmaceutical composition according to claim 1, wherein the pharmaceutical composition provides a therapeutic effect in respect of each of guaifenesin, naproxen and dextromethorphan for a period of up to 12 hours.
 28. A pharmaceutical composition according to claim 1, further comprising at least one pharmaceutically acceptable component, wherein about 100% of naproxen dissolves within 30 minutes in a pH 6.8 phosphate buffer.
 29. (canceled)
 30. The pharmaceutical composition according to claim 28, wherein the pharmaceutical composition comprises: (a) 58 - 63% guaifenesin; (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 - 3% hypromellose; (e) 5 - 8% microcrystalline cellulose; (f) 1 - 2 % hydroxyethyl cellulose; (g) 0.5 - 2.5% croscarmellose sodium; (h) 0.5 - 1.5% sodium lauryl sulfate; (i) 5 - 8% sodium bicarbonate; (j) 5 - 8% polyethylene glycol 4000; and (k) 0.5 - 1% magnesium stearate.
 31. A pharmaceutical composition according to claim 1, further comprising at least one pharmaceutically acceptable component, wherein the pharmaceutical composition provides a mean C_(max) and at least one of a mean AUCinf and a mean AUC₀₋₁₂ for naproxen under fasted conditions based on single-dose administration that are from 80% to 125% of the mean C_(max) and at least one of the mean ADC_(inf) and the mean AUC₀-₁₂ for naproxen provided by a pharmaceutical composition comprising (a) 58 - 63% guaifenesin; (b) 2 - 3.5 % dextromethorphan or a pharmaceutically acceptable salt thereof; (c) 10 - 12% naproxen or a pharmaceutically acceptable salt thereof; (d) 1 -3% hypromellose; (e) 5 - 8% microcrystalline cellulose; (f) 1 - 2 % hydroxyethyl cellulose; (g) 0.5 - 2.5% croscarmellose sodium; (h) 0.5 - 1.5% sodium lauryl sulfate; (i) 5 - 8% sodium bicarbonate; (j) 5 - 8% polyethylene glycol 4000; and (k) 0.5 - 1% magnesium stearate.
 32. (canceled) 